Undercoat Layer Conductivity via Mixed Metal Oxides
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Solution Overview
Problem
Electrophotographic photosensitive members with undercoat layers containing only aluminum oxide particles experience significant dark decay under low-temperature and low-humidity environments, leading to positive ghost image generation, while increasing titanium oxide particles in the undercoat layer can cause cracking under high-temperature and high-humidity conditions, making it difficult to simultaneously suppress ghost images and cracking.
Innovation Solution
Incorporating a mixture of aluminum oxide and titanium oxide particles into the undercoat layer with a specific mass ratio (0.25≤MAl/MTi≤1,000) to achieve conductivity and uniform dispersion, thereby reducing charge accumulation and preventing cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only aluminum oxide particles are incorporated into the undercoat layer, then the undercoat layer has good stability under high-temperature and high-humidity environment, but significant dark decay occurs under low-temperature and low-humidity environment, leading to positive ghost image generation
Solution Approach 1:
The undercoat layer uses a composite material system comprising aluminum oxide particles and titanium oxide particles in a specific mass ratio (0.01 < MAl/MTi ≤ 1000). This composite structure combines the environmental stability of aluminum oxide with the dark decay suppression capability of titanium oxide, resolving the contradiction between stability and ghost image prevention.
2Object-generated harmful factors
If the content of titanium oxide particles is increased in the undercoat layer, then positive ghost image generation is suppressed, but cracking occurs under high-temperature and high-humidity environment
Solution Approach 1:
The patent precisely controls the mass ratio parameter MAl/MTi within the range 0.01 < MAl/MTi ≤ 1000. This parameter optimization balances the competing requirements: enough titanium oxide to suppress dark decay and ghost images, but sufficient aluminum oxide to maintain structural integrity and prevent cracking under thermal stress.
3Strength
If the mass ratio of aluminum oxide to titanium oxide is increased, then cracking is suppressed under high-temperature and high-humidity environment, but positive ghost image generation increases under low-temperature and low-humidity environment
Solution Approach 1:
By adjusting the mass ratio MAl/MTi within the optimal range, the patent achieves a balance where the undercoat layer maintains sufficient mechanical strength to prevent cracking while containing enough titanium oxide to suppress dark decay and associated ghost image formation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses positive ghost image generation under low-temperature and low-humidity conditions and prevents cracking under high-temperature and high-humidity environments, ensuring both image quality and durability of the electrophotographic photosensitive member.
Implementation Method 1
the undercoat layer has functions to inhibit charge injection from the support and transport electrons generated in the photosensitive layer
Implementation Method 2
there is liable to occur charge is accumulated in the vicinity of an interface between the photosensitive layer and the undercoat layer, with the result that there is a problem in that a ghost phenomenon is liable to occur
Data Source
AI summary
Provided is an electrophotographic photosensitive member in which the generation of a positive ghost image is suppressed under a low-temperature and low-humidity environment, and the occurrence of cracking is suppressed under a high-temperature and high-humidity environment. Also provided are a process cartridge mounted with the electrophotographic photosensitive member, and an electrophotographic apparatus including the process cartridge. The electrophotographic photosensitive member of the present disclosure is characterized in that an undercoat layer contains aluminum oxide particles and titanium oxide particles at a specific mass ratio.